[mirror_ubuntu-artful-kernel.git] / fs / lockd / svc4proc.c

/*
 * linux/fs/lockd/svc4proc.c
 *
 * Lockd server procedures. We don't implement the NLM_*_RES 
 * procedures because we don't use the async procedures.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/lockd/sm_inter.h>


#define NLMDBG_FACILITY		NLMDBG_CLIENT

/*
 * Obtain client and file from arguments
 */
static __be32
nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
			struct nlm_host **hostp, struct nlm_file **filp)
{
	struct nlm_host		*host = NULL;
	struct nlm_file		*file = NULL;
	struct nlm_lock		*lock = &argp->lock;
	__be32			error = 0;

	/* nfsd callbacks must have been installed for this procedure */
	if (!nlmsvc_ops)
		return nlm_lck_denied_nolocks;

	/* Obtain host handle */
	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
	 || (argp->monitor && nsm_monitor(host) < 0))
		goto no_locks;
	*hostp = host;

	/* Obtain file pointer. Not used by FREE_ALL call. */
	if (filp != NULL) {
		if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
			goto no_locks;
		*filp = file;

		/* Set up the missing parts of the file_lock structure */
		lock->fl.fl_file  = file->f_file;
		lock->fl.fl_owner = (fl_owner_t) host;
		lock->fl.fl_lmops = &nlmsvc_lock_operations;
	}

	return 0;

no_locks:
	if (host)
		nlm_release_host(host);
 	if (error)
		return error;	
	return nlm_lck_denied_nolocks;
}

/*
 * NULL: Test for presence of service
 */
static __be32
nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	dprintk("lockd: NULL          called\n");
	return rpc_success;
}

/*
 * TEST: Check for conflicting lock
 */
static __be32
nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: TEST4        called\n");
	resp->cookie = argp->cookie;

	/* Don't accept test requests during grace period */
	if (nlmsvc_grace_period) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now check for conflicting locks */
	resp->status = nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie);
	if (resp->status == nlm_drop_reply)
		return rpc_drop_reply;

	dprintk("lockd: TEST4          status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

static __be32
nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: LOCK          called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (nlmsvc_grace_period && !argp->reclaim) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

#if 0
	/* If supplied state doesn't match current state, we assume it's
	 * an old request that time-warped somehow. Any error return would
	 * do in this case because it's irrelevant anyway.
	 *
	 * NB: We don't retrieve the remote host's state yet.
	 */
	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
		resp->status = nlm_lck_denied_nolocks;
	} else
#endif

	/* Now try to lock the file */
	resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
					argp->block, &argp->cookie);

	dprintk("lockd: LOCK          status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

static __be32
nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: CANCEL        called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (nlmsvc_grace_period) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Try to cancel request. */
	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);

	dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

/*
 * UNLOCK: release a lock
 */
static __be32
nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: UNLOCK        called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (nlmsvc_grace_period) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to remove the lock */
	resp->status = nlmsvc_unlock(file, &argp->lock);

	dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

/*
 * GRANTED: A server calls us to tell that a process' lock request
 * was granted
 */
static __be32
nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	resp->cookie = argp->cookie;

	dprintk("lockd: GRANTED       called\n");
	resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
	dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
	return rpc_success;
}

/*
 * This is the generic lockd callback for async RPC calls
 */
static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

static void nlm4svc_callback_release(void *data)
{
	nlm_release_call(data);
}

static const struct rpc_call_ops nlm4svc_callback_ops = {
	.rpc_call_done = nlm4svc_callback_exit,
	.rpc_release = nlm4svc_callback_release,
};

/*
 * `Async' versions of the above service routines. They aren't really,
 * because we send the callback before the reply proper. I hope this
 * doesn't break any clients.
 */
static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
		__be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
{
	struct nlm_host	*host;
	struct nlm_rqst	*call;
	__be32 stat;

	host = nlmsvc_lookup_host(rqstp,
				  argp->lock.caller,
				  argp->lock.len);
	if (host == NULL)
		return rpc_system_err;

	call = nlm_alloc_call(host);
	if (call == NULL)
		return rpc_system_err;

	stat = func(rqstp, argp, &call->a_res);
	if (stat != 0) {
		nlm_release_call(call);
		return stat;
	}

	call->a_flags = RPC_TASK_ASYNC;
	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: TEST_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
}

static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: LOCK_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
}

static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					       void	       *resp)
{
	dprintk("lockd: CANCEL_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
}

static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                               void            *resp)
{
	dprintk("lockd: UNLOCK_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
}

static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                void            *resp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
}

/*
 * SHARE: create a DOS share or alter existing share.
 */
static __be32
nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
				          struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: SHARE         called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (nlmsvc_grace_period && !argp->reclaim) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to create the share */
	resp->status = nlmsvc_share_file(host, file, argp);

	dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

/*
 * UNSHARE: Release a DOS share.
 */
static __be32
nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: UNSHARE       called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (nlmsvc_grace_period) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to lock the file */
	resp->status = nlmsvc_unshare_file(host, file, argp);

	dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

/*
 * NM_LOCK: Create an unmonitored lock
 */
static __be32
nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	dprintk("lockd: NM_LOCK       called\n");

	argp->monitor = 0;		/* just clean the monitor flag */
	return nlm4svc_proc_lock(rqstp, argp, resp);
}

/*
 * FREE_ALL: Release all locks and shares held by client
 */
static __be32
nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void            *resp)
{
	struct nlm_host	*host;

	/* Obtain client */
	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
		return rpc_success;

	nlmsvc_free_host_resources(host);
	nlm_release_host(host);
	return rpc_success;
}

/*
 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 */
static __be32
nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
					      void	        *resp)
{
	struct sockaddr_in	saddr;

	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));

	dprintk("lockd: SM_NOTIFY     called\n");
	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	 || ntohs(saddr.sin_port) >= 1024) {
		char buf[RPC_MAX_ADDRBUFLEN];
		printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
				svc_print_addr(rqstp, buf, sizeof(buf)));
		return rpc_system_err;
	}

	/* Obtain the host pointer for this NFS server and try to
	 * reclaim all locks we hold on this server.
	 */
	memset(&saddr, 0, sizeof(saddr));
	saddr.sin_addr.s_addr = argp->addr;
	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);

	return rpc_success;
}

/*
 * client sent a GRANTED_RES, let's remove the associated block
 */
static __be32
nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
                                                void            *resp)
{
        if (!nlmsvc_ops)
                return rpc_success;

        dprintk("lockd: GRANTED_RES   called\n");

        nlmsvc_grant_reply(&argp->cookie, argp->status);
        return rpc_success;
}


/*
 * NLM Server procedures.
 */

#define nlm4svc_encode_norep	nlm4svc_encode_void
#define nlm4svc_decode_norep	nlm4svc_decode_void
#define nlm4svc_decode_testres	nlm4svc_decode_void
#define nlm4svc_decode_lockres	nlm4svc_decode_void
#define nlm4svc_decode_unlockres	nlm4svc_decode_void
#define nlm4svc_decode_cancelres	nlm4svc_decode_void
#define nlm4svc_decode_grantedres	nlm4svc_decode_void

#define nlm4svc_proc_none	nlm4svc_proc_null
#define nlm4svc_proc_test_res	nlm4svc_proc_null
#define nlm4svc_proc_lock_res	nlm4svc_proc_null
#define nlm4svc_proc_cancel_res	nlm4svc_proc_null
#define nlm4svc_proc_unlock_res	nlm4svc_proc_null

struct nlm_void			{ int dummy; };

#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func	= (svc_procfunc) nlm4svc_proc_##name,	\
   .pc_decode	= (kxdrproc_t) nlm4svc_decode_##xargt,	\
   .pc_encode	= (kxdrproc_t) nlm4svc_encode_##xrest,	\
   .pc_release	= NULL,					\
   .pc_argsize	= sizeof(struct nlm_##argt),		\
   .pc_ressize	= sizeof(struct nlm_##rest),		\
   .pc_xdrressize = respsize,				\
 }
#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
#define	No	(1+1024/4)				/* netobj */
#define	St	1					/* status */
#define	Rg	4					/* range (offset + length) */
struct svc_procedure		nlmsvc_procedures4[] = {
  PROC(null,		void,		void,		void,	void, 1),
  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
  PROC(granted,		testargs,	res,		args,	res, Ck+St),
  PROC(test_msg,	testargs,	norep,		args,	void, 1),
  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
  PROC(test_res,	testres,	norep,		res,	void, 1),
  PROC(lock_res,	lockres,	norep,		res,	void, 1),
  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
  PROC(granted_res,	res,		norep,		res,	void, 1),
  /* statd callback */
  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(free_all,	notify,		void,		args,	void, 1),

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svc4proc.c
	3	*
	4	* Lockd server procedures. We don't implement the NLM_*_RES
	5	* procedures because we don't use the async procedures.
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
	10	#include <linux/types.h>
	11	#include <linux/time.h>
	12	#include <linux/slab.h>
	13	#include <linux/in.h>
	14	#include <linux/sunrpc/svc.h>
	15	#include <linux/sunrpc/clnt.h>
	16	#include <linux/nfsd/nfsd.h>
	17	#include <linux/lockd/lockd.h>
	18	#include <linux/lockd/share.h>
	19	#include <linux/lockd/sm_inter.h>
	20
	21
	22	#define NLMDBG_FACILITY NLMDBG_CLIENT
	23
1da177e4 LT	24	/*
	25	* Obtain client and file from arguments
	26	*/
52921e02	27	static __be32
1da177e4 LT	28	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	29	struct nlm_host hostp, struct nlm_file filp)
	30	{
	31	struct nlm_host *host = NULL;
	32	struct nlm_file *file = NULL;
	33	struct nlm_lock *lock = &argp->lock;
52921e02	34	__be32 error = 0;
1da177e4 LT	35
	36	/* nfsd callbacks must have been installed for this procedure */
	37	if (!nlmsvc_ops)
	38	return nlm_lck_denied_nolocks;
	39
	40	/* Obtain host handle */
db4e4c9a	41	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	42	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	43	goto no_locks;
	44	*hostp = host;
	45
	46	/* Obtain file pointer. Not used by FREE_ALL call. */
	47	if (filp != NULL) {
	48	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	49	goto no_locks;
	50	*filp = file;
	51
	52	/* Set up the missing parts of the file_lock structure */
	53	lock->fl.fl_file = file->f_file;
	54	lock->fl.fl_owner = (fl_owner_t) host;
	55	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	56	}
	57
	58	return 0;
	59
	60	no_locks:
	61	if (host)
	62	nlm_release_host(host);
	63	if (error)
	64	return error;
	65	return nlm_lck_denied_nolocks;
	66	}
	67
	68	/*
	69	* NULL: Test for presence of service
	70	*/
7111c66e	71	static __be32
1da177e4 LT	72	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	73	{
	74	dprintk("lockd: NULL called\n");
	75	return rpc_success;
	76	}
	77
	78	/*
	79	* TEST: Check for conflicting lock
	80	*/
7111c66e	81	static __be32
1da177e4 LT	82	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	83	struct nlm_res *resp)
	84	{
	85	struct nlm_host *host;
	86	struct nlm_file *file;
	87
	88	dprintk("lockd: TEST4 called\n");
	89	resp->cookie = argp->cookie;
	90
	91	/* Don't accept test requests during grace period */
	92	if (nlmsvc_grace_period) {
	93	resp->status = nlm_lck_denied_grace_period;
	94	return rpc_success;
	95	}
	96
	97	/* Obtain client and file */
	98	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	99	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	100
1da177e4 LT	101	/* Now check for conflicting locks */
85f3f1b3	102	resp->status = nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750 ME	103	if (resp->status == nlm_drop_reply)
5ea0d750 ME	104	return rpc_drop_reply;
1da177e4 LT	105
	106	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
	107	nlm_release_host(host);
	108	nlm_release_file(file);
	109	return rpc_success;
	110	}
	111
7111c66e	112	static __be32
1da177e4 LT	113	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	114	struct nlm_res *resp)
	115	{
	116	struct nlm_host *host;
	117	struct nlm_file *file;
	118
	119	dprintk("lockd: LOCK called\n");
	120
	121	resp->cookie = argp->cookie;
	122
	123	/* Don't accept new lock requests during grace period */
	124	if (nlmsvc_grace_period && !argp->reclaim) {
	125	resp->status = nlm_lck_denied_grace_period;
	126	return rpc_success;
	127	}
	128
	129	/* Obtain client and file */
	130	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	131	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	132
	133	#if 0
	134	/* If supplied state doesn't match current state, we assume it's
	135	* an old request that time-warped somehow. Any error return would
	136	* do in this case because it's irrelevant anyway.
	137	*
	138	* NB: We don't retrieve the remote host's state yet.
	139	*/
	140	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	141	resp->status = nlm_lck_denied_nolocks;
	142	} else
	143	#endif
	144
	145	/* Now try to lock the file */
	146	resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
	147	argp->block, &argp->cookie);
	148
	149	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
	150	nlm_release_host(host);
	151	nlm_release_file(file);
	152	return rpc_success;
	153	}
	154
7111c66e	155	static __be32
1da177e4 LT	156	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	157	struct nlm_res *resp)
	158	{
	159	struct nlm_host *host;
	160	struct nlm_file *file;
	161
	162	dprintk("lockd: CANCEL called\n");
	163
	164	resp->cookie = argp->cookie;
	165
	166	/* Don't accept requests during grace period */
	167	if (nlmsvc_grace_period) {
	168	resp->status = nlm_lck_denied_grace_period;
	169	return rpc_success;
	170	}
	171
	172	/* Obtain client and file */
	173	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	174	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	175
	176	/* Try to cancel request. */
	177	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
	178
	179	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	180	nlm_release_host(host);
	181	nlm_release_file(file);
	182	return rpc_success;
	183	}
	184
	185	/*
	186	* UNLOCK: release a lock
	187	*/
7111c66e	188	static __be32
1da177e4 LT	189	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	190	struct nlm_res *resp)
	191	{
	192	struct nlm_host *host;
	193	struct nlm_file *file;
	194
	195	dprintk("lockd: UNLOCK called\n");
	196
	197	resp->cookie = argp->cookie;
	198
	199	/* Don't accept new lock requests during grace period */
	200	if (nlmsvc_grace_period) {
	201	resp->status = nlm_lck_denied_grace_period;
	202	return rpc_success;
	203	}
	204
	205	/* Obtain client and file */
	206	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	207	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	208
	209	/* Now try to remove the lock */
	210	resp->status = nlmsvc_unlock(file, &argp->lock);
	211
	212	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	213	nlm_release_host(host);
	214	nlm_release_file(file);
	215	return rpc_success;
	216	}
	217
	218	/*
	219	* GRANTED: A server calls us to tell that a process' lock request
	220	* was granted
	221	*/
7111c66e	222	static __be32
1da177e4 LT	223	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	224	struct nlm_res *resp)
	225	{
	226	resp->cookie = argp->cookie;
	227
	228	dprintk("lockd: GRANTED called\n");
27459f09	229	resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
1da177e4 LT	230	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	231	return rpc_success;
	232	}
	233
d4716624 TM	234	/*
	235	* This is the generic lockd callback for async RPC calls
	236	*/
	237	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	238	{
c041b5ff	239	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	240	-task->tk_status);
	241	}
	242
	243	static void nlm4svc_callback_release(void *data)
	244	{
	245	nlm_release_call(data);
	246	}
	247
	248	static const struct rpc_call_ops nlm4svc_callback_ops = {
	249	.rpc_call_done = nlm4svc_callback_exit,
	250	.rpc_release = nlm4svc_callback_release,
	251	};
	252
1da177e4 LT	253	/*
	254	* `Async' versions of the above service routines. They aren't really,
	255	* because we send the callback before the reply proper. I hope this
	256	* doesn't break any clients.
	257	*/
7111c66e AV	258	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	259	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	260	{
d4716624 TM	261	struct nlm_host *host;
d4716624 TM	262	struct nlm_rqst *call;
7111c66e	263	__be32 stat;
1da177e4	264
db4e4c9a OK	265	host = nlmsvc_lookup_host(rqstp,
	266	argp->lock.caller,
	267	argp->lock.len);
d4716624 TM	268	if (host == NULL)
	269	return rpc_system_err;
	270
	271	call = nlm_alloc_call(host);
	272	if (call == NULL)
	273	return rpc_system_err;
	274
	275	stat = func(rqstp, argp, &call->a_res);
	276	if (stat != 0) {
	277	nlm_release_call(call);
	278	return stat;
	279	}
1da177e4	280
d4716624 TM	281	call->a_flags = RPC_TASK_ASYNC;
	282	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	283	return rpc_system_err;
	284	return rpc_success;
1da177e4 LT	285	}
1da177e4 LT	286
7111c66e	287	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	288	void *resp)
1da177e4 LT	289	{
d4716624 TM	290	dprintk("lockd: TEST_MSG called\n");
	291	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	292	}
1da177e4	293
7111c66e	294	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	295	void *resp)
d4716624 TM	296	{
1da177e4	297	dprintk("lockd: LOCK_MSG called\n");
d4716624	298	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	299	}
1da177e4 LT	300
7111c66e	301	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	302	void *resp)
1da177e4 LT	303	{
1da177e4	304	dprintk("lockd: CANCEL_MSG called\n");
d4716624	305	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	306	}
1da177e4 LT	307
7111c66e	308	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	309	void *resp)
1da177e4 LT	310	{
1da177e4	311	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	312	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	313	}
1da177e4 LT	314
7111c66e	315	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	316	void *resp)
1da177e4 LT	317	{
1da177e4	318	dprintk("lockd: GRANTED_MSG called\n");
d4716624	319	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	320	}
	321
	322	/*
	323	* SHARE: create a DOS share or alter existing share.
	324	*/
7111c66e	325	static __be32
1da177e4 LT	326	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	327	struct nlm_res *resp)
	328	{
	329	struct nlm_host *host;
	330	struct nlm_file *file;
	331
	332	dprintk("lockd: SHARE called\n");
	333
	334	resp->cookie = argp->cookie;
	335
	336	/* Don't accept new lock requests during grace period */
	337	if (nlmsvc_grace_period && !argp->reclaim) {
	338	resp->status = nlm_lck_denied_grace_period;
	339	return rpc_success;
	340	}
	341
	342	/* Obtain client and file */
	343	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	344	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	345
	346	/* Now try to create the share */
	347	resp->status = nlmsvc_share_file(host, file, argp);
	348
	349	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	350	nlm_release_host(host);
	351	nlm_release_file(file);
	352	return rpc_success;
	353	}
	354
	355	/*
	356	* UNSHARE: Release a DOS share.
	357	*/
7111c66e	358	static __be32
1da177e4 LT	359	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	360	struct nlm_res *resp)
	361	{
	362	struct nlm_host *host;
	363	struct nlm_file *file;
	364
	365	dprintk("lockd: UNSHARE called\n");
	366
	367	resp->cookie = argp->cookie;
	368
	369	/* Don't accept requests during grace period */
	370	if (nlmsvc_grace_period) {
	371	resp->status = nlm_lck_denied_grace_period;
	372	return rpc_success;
	373	}
	374
	375	/* Obtain client and file */
	376	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	377	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	378
	379	/* Now try to lock the file */
	380	resp->status = nlmsvc_unshare_file(host, file, argp);
	381
	382	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	383	nlm_release_host(host);
	384	nlm_release_file(file);
	385	return rpc_success;
	386	}
	387
	388	/*
	389	* NM_LOCK: Create an unmonitored lock
	390	*/
7111c66e	391	static __be32
1da177e4 LT	392	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	393	struct nlm_res *resp)
	394	{
	395	dprintk("lockd: NM_LOCK called\n");
	396
	397	argp->monitor = 0; /* just clean the monitor flag */
	398	return nlm4svc_proc_lock(rqstp, argp, resp);
	399	}
	400
	401	/*
	402	* FREE_ALL: Release all locks and shares held by client
	403	*/
7111c66e	404	static __be32
1da177e4 LT	405	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	406	void *resp)
	407	{
	408	struct nlm_host *host;
	409
	410	/* Obtain client */
	411	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	412	return rpc_success;
	413
	414	nlmsvc_free_host_resources(host);
	415	nlm_release_host(host);
	416	return rpc_success;
	417	}
	418
	419	/*
	420	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	421	*/
7111c66e	422	static __be32
1da177e4 LT	423	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	424	void *resp)
	425	{
27459f09 CL	426	struct sockaddr_in saddr;
	427
	428	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
1da177e4 LT	429
	430	dprintk("lockd: SM_NOTIFY called\n");
	431	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	432	\|\| ntohs(saddr.sin_port) >= 1024) {
ad06e4bd CL	433	char buf[RPC_MAX_ADDRBUFLEN];
	434	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	435	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	436	return rpc_system_err;
	437	}
	438
	439	/* Obtain the host pointer for this NFS server and try to
	440	* reclaim all locks we hold on this server.
	441	*/
cf712c24	442	memset(&saddr, 0, sizeof(saddr));
1da177e4	443	saddr.sin_addr.s_addr = argp->addr;
5c8dd29c	444	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
1da177e4	445
1da177e4 LT	446	return rpc_success;
	447	}
	448
	449	/*
	450	* client sent a GRANTED_RES, let's remove the associated block
	451	*/
7111c66e	452	static __be32
1da177e4 LT	453	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	454	void *resp)
	455	{
	456	if (!nlmsvc_ops)
	457	return rpc_success;
	458
	459	dprintk("lockd: GRANTED_RES called\n");
	460
39be4502	461	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	462	return rpc_success;
	463	}
	464
	465
1da177e4 LT	466	/*
	467	* NLM Server procedures.
	468	*/
	469
	470	#define nlm4svc_encode_norep nlm4svc_encode_void
	471	#define nlm4svc_decode_norep nlm4svc_decode_void
	472	#define nlm4svc_decode_testres nlm4svc_decode_void
	473	#define nlm4svc_decode_lockres nlm4svc_decode_void
	474	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	475	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	476	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	477
	478	#define nlm4svc_proc_none nlm4svc_proc_null
	479	#define nlm4svc_proc_test_res nlm4svc_proc_null
	480	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	481	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	482	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	483
	484	struct nlm_void { int dummy; };
	485
	486	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	487	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	488	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	489	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	490	.pc_release = NULL, \
	491	.pc_argsize = sizeof(struct nlm_##argt), \
	492	.pc_ressize = sizeof(struct nlm_##rest), \
	493	.pc_xdrressize = respsize, \
	494	}
	495	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	496	#define No (1+1024/4) /* netobj */
	497	#define St 1 /* status */
	498	#define Rg 4 /* range (offset + length) */
	499	struct svc_procedure nlmsvc_procedures4[] = {
	500	PROC(null, void, void, void, void, 1),
	501	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	502	PROC(lock, lockargs, res, args, res, Ck+St),
	503	PROC(cancel, cancargs, res, args, res, Ck+St),
	504	PROC(unlock, unlockargs, res, args, res, Ck+St),
	505	PROC(granted, testargs, res, args, res, Ck+St),
	506	PROC(test_msg, testargs, norep, args, void, 1),
	507	PROC(lock_msg, lockargs, norep, args, void, 1),
	508	PROC(cancel_msg, cancargs, norep, args, void, 1),
	509	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	510	PROC(granted_msg, testargs, norep, args, void, 1),
	511	PROC(test_res, testres, norep, res, void, 1),
	512	PROC(lock_res, lockres, norep, res, void, 1),
	513	PROC(cancel_res, cancelres, norep, res, void, 1),
	514	PROC(unlock_res, unlockres, norep, res, void, 1),
	515	PROC(granted_res, res, norep, res, void, 1),
	516	/* statd callback */
	517	PROC(sm_notify, reboot, void, reboot, void, 1),
	518	PROC(none, void, void, void, void, 0),
	519	PROC(none, void, void, void, void, 0),
	520	PROC(none, void, void, void, void, 0),
	521	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	522	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	523	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	524	PROC(free_all, notify, void, args, void, 1),
	525
	526	};